You must have come across sentences of the type below in spoken (and perhaps even in written)Urdu.

das baje ke ba'd aap be-shak gaaRii le jaa sakte haiN!

After ten o'clock you can most certainly take the car.

But the speaker does not have the concept of certainty in mind at all. What he/she does mean is "if you so wish". Is this kind of "be-shak" usage common amongst Urdu speakers and considered acceptable.

Well, as far as Urdu is concerned, I've heard this used on Pakistani television, so I'm assuming it's 1) not just a Hindi thing but a pan-Hindustani thing 2) common for Urdu speakers.

Anyway, it's used like this all the time in Hindi and I see it written often too. It has a conversational nuance, so you're not likely to see it in an article on a grave issue.
This was actually the way I first learnt to use this word . It wasn't until much later (like this year, haha) that I learnt the "certainly,without doubt" meaning.

Well, as far as Urdu is concerned, I've heard this used on Pakistani television, so I'm assuming it's 1) not just a Hindi thing but a pan-Hindustani thing 2) common for Urdu speakers.

Anyway, it's used like this all the time in Hindi and I see it written often too. It has a conversational nuance, so you're not likely to see it in an article on a grave issue.
This was actually the way I first learnt to use this word . It wasn't until much later (like this year, haha) that I learnt the "certainly,without doubt" meaning.